Improvement in blasting-plugs



.arnnfr @Enron GIDEON FRISBEE, OF READING, PENNSYLVANIA.

IMPRCVEMENT IN BLASTlNG-PLUGS.

Specification forming part of Letters Patent BT01422533 dated February 10, 1874; application led December 4, 1873. l

To all whom it may concern.'

Be it known that I, GrDEoN Farsnnn, of Reading, in the county of Berks and State of Pennsylvania, have invented a new and usei'ul llug for Blastin0r in Long Holes; and I do hereby declare the ollowin g to be a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the said invention, reterence being had to the accompanying drawing, which i'ornis a part ot' this specification.

Figure l of the drawing is an elevation of the plug; and Fig. 2, a section thereof, taken through its axis.

This invention consists in a plug' of such construction that it may be easily wedged into a drill-hole to forni a bed or recoil-block for the charge, and more tirnlly wedged against the walls ot the hole by the explosion ot' said charge, as hereinafter described.

A is a metal cylinder, whose diameter is slightly less than that of the hole, and whose lower end is wedge-shaped. C is a bolt passing through a hole in the middle otl A, and made with a screw-thread on its lower end, a lug, Il, on one side ot' its upper end, and a collar, I, tittin into a recess in the upper part ot' A. Ii I3 are two pieces of met-al, through which bolt- U also passes, made with inclined inner surfaces at their upper ends to receive the lower end of A. E is a recess niade in B li, to receive the nut I), which is screwed on G is a cap screwed into A to keep the collar I in place. I is a cap fitting ou top of A, and covering the upper end of bolt C, and made with a conical top, K, and a projecting knob, L, which assist in removing it from the hole. M is a packing-ring, of lead or other soft lnetal, leather, or other suitable substance, which iits over cone K, and is forced downward and outward by the explosion of the charge, so as to fill the hole and prevent gas from escaping into it.

ln operation, aholc having been bored to a sufficient depth for the insertion and explosion of several charges, the plug, without the cap I, is inserted into the hole, at the proper depth, by means of a socket-wrench, which is placed on the upper end of the bolt C and then turned, so as to force I3V B upward by the action ofthe screw and nut, thereby forcing I3 I3 apart and against the walls of the hole, and wedging the plug i'irmly therein. The wrench is then removed and cap I and packing-ring M put on. The plug having been thus fixed in position, the charge is then in# serted, tamped, and lired in the usual manner. The charges in all the holes should be tired simultaneously. The force of the explosion is received on the packing-ring M, cap I, and cylinder A, wedgin g the latter in farther between B B, and thereby forcing the plug more rmly against the sides of the hole.

After tiring, the plug may be removed or inserted deeper into the hole, by iirst withdrawing the cap I and packing-ring by means of a suitable hook applied to knob L, and then loosening the plug by 'means of the socketwrench, which is now turned in the reverse direction. rIhis wrench should have a lateral recess on each side ofthe groove, which receives the lug H, so as to raise and lower the plug in vertical or adj ust it in horizontal holes. rIhe plug having been again ixed in the hole at the proper distance 'to support the charge, as above described, the charging, tampin g, and firing are again repeated, and the operation continued as long as may be necessary.

What I claim as my invention, and desire to secure by Letters Patent et' the United States,

The above-described plug, consisting of cylinder A, pieces B B, screw-bolt C, nut D, cap I, and packing-ring M, all constructed and arranged substantially as described.

WVitnesses: GIDEON FRISBEE.

DANIEL C. WIELAND, F. M. BANKS. 

